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CachedList (JBoss/Common API) - JBoss 4.0.1 sp1 common API Documentation 英文版文档

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org.jboss.util.collection
Class CachedList

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractList
          org.jboss.util.collection.CachedList

All Implemented Interfaces:

Collection, List

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public class CachedList

extends AbstractList

A wrapper around a List which translates added objects into SoftObject references, allowing the VM to garbage collect objects in the collection when memory is low.

Version:

$Revision: 1.3 $

Author:

Jason Dillon

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Field Summary
protected  List	list           Wrapped list.
protected  ReferenceQueue	queue           Reference queue.

 

Fields inherited from class java.util.AbstractList

modCount

 

Constructor Summary

CachedList()           Construct a CachedList using a LinkedList for storage.

CachedList(List list)           Construct a CachedList.

 

Method Summary
void	add(int index, Object obj)           Inserts the specified element at the specified position in this list (optional operation).
Object	get(int index)           Returns the element at the specified position in this list.
Object	remove(int index)           Removes the element at the specified position in this list (optional operation).
Object	set(int index, Object obj)           Replaces the element at the specified position in this list with the specified element.
int	size()           Return the size of the list.

 

Methods inherited from class java.util.AbstractList

add, addAll, clear, equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, removeRange, subList

 

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Methods inherited from interface java.util.List

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray

 

Field Detail

queue

protected final ReferenceQueue queue

Reference queue.

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list

protected final List list

Wrapped list.

Constructor Detail

CachedList

public CachedList(List list)

Construct a CachedList.

Parameters:

list - List to wrap.

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CachedList

public CachedList()

Construct a CachedList using a LinkedList for storage.

Method Detail

get

public Object get(int index)

Returns the element at the specified position in this list.

Parameters:

index - Index of element to return.

Returns:

The element at the specified position.

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size

public int size()

Return the size of the list.

Returns:

The number of elements in the list.

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set

public Object set(int index,
                  Object obj)

Replaces the element at the specified position in this list with the specified element.

Parameters:

index - Index of element to replace.

obj - Element to be stored at the specified postion.

Returns:

The previous element at the given index.

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add

public void add(int index,
                Object obj)

Inserts the specified element at the specified position in this list (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).

Parameters:

index - Index at which the specified element is to be inserted.

obj - Element to be inserted.

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remove

public Object remove(int index)

Removes the element at the specified position in this list (optional operation). Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.

Parameters:

index - The index of the element to remove.

Returns:

The element previously at the specified position.

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